Electric-arc lamp



July, 7, 1925. 1,544,900

E. GIESE ELECTRI 0 ARC LAMP Filed Sept. 26, 1922 2 Sheets-Sheet 1 July 7, 1925. 1,544,900

E. GIESE ELECTRIC ARC LAMP Filed Sept. 26, 1922 2 Sheets-Sheet 2 7V? in 935 es:

? J2 yen for:

Patented July 7, 1925.

UNITED sures PATENT orrlca EEICH GIESE, OF BERLIN, GEBMANY, ASSIGNOR TO THE FIRM JUPITER KUNST- LIGHT KERSTEN 66 BRASCH, F FRANKFURT-ONTHE-MAIN AND BERLIN,

GERMANY.

ELECTRIC-ARC LAMP.

To all whom it may concern:

Be it known that I, Enron Ginsu, electrical engineer, a citizen of Germany, and a resident of 39/4t0 Kottbuser Ufer, in the city of Berlin, Germany, have invented certain-new and useful Improvements in Electric-Arc Lamps, of which the following is a specification.

This invention refers to an electric arc lamp with heated wire regulation, and it is particularly adapted for the taking of pietures for photographic and cinematographic purposes, and in its broad aspects the invention refers to the regulation of two or more pairs of electrodes by means of a single length of heated wire. Provision is also made according to my invention to insure the satisfactory and uniform burning of the electrodes, and their independent operation even with an irregular consumption of the same and with different lengths of pairs of carbons, and without interfering with the operation of the regulating means in commen for both electrodes.

The invention is shown on the accompanying drawing by way of examples as a form of embodiment of the principles of my invention.

Figure 1 is a plan view of a heated wire arc lamp in accordance with my invention; Figure 2 is an elevation, and Figure 3 is a side view.

Upon an insulated base plate a and by means of a support cl one of the two movable electrode sockets e, is mounted at f, their movement being limited by an adjustable stop g, one support each being provided for each electrode. The movable electrodes 10,, and the electrodes is, which are stationarily mounted in their supports 0 are passed through longitudinal holes of an insulating protecting plate 5 connected by distance pieces 0 with the plate a. The two carbon holders 6, and 6 of each pair of electrodes are separated from each other by insulating Application filed September 26 1922. Serial No, 590,682.

screw stops 0 arcintended to merely indicatethe allowable maximum of movement of the movable electrodes. The formation of the arc of light is efi'ected by a stud s centrally and displaceably guided in a support p upon the rear side of the insulating plate a. To this stud s a balance beam 9 is tiltingly pivoted at T which is displaceable along the guide rods u and the ends of which are provided with adjustable screws adapted for independent cooperation with the extensions 2' of the movable electrode holders 0,, the said extensions 2' being connected by an electric conductor a, and being mounted upon insulating supports, inde pendent operation of the conducting screws j being insured by the movable mounting of all cooperating members so that each of the screws j may be adjusted independently of the other screw j. At the lower end of the central stud s which is acted upon by a com pression spring t the heating wire 10 is secured the ends of which are adjustably secured in the clamps o and is taken around the guides Q0. The lengthening of the wire by the passage of the current through it causes the stud s to be pulled downwards in the guiding support 12 by the action of the compression spring 27. By this means the scale beam 9 with its adjustable screws j makes contact with the extensions 2' of the movable carbon holder 0,, whereby the electrodes are drawn apart and the arc formed, the screw stops j acting as a means of tilting the movable electrodes 70,. Current is admitted to the electrodes through their extensions 2' as shown in Figures 2 and 3 of the drawing, the two movable electrodes is, and k, being arranged in parallel connection, and the heating or resistance wire to preferably constituting a shunt on the main circuit, so that a sufiiciency of current to influence the length of the wire 10 may pass therethrough in accordance with the length of the arc and the amount of current which is on the main circuit. The amount of current which passes through the shunt wire 10 on which the compression of the spring It depends, depending on the length of arc and consequently on the amount of current on the main circuit, the relative position of the electrodes will be adjusted by the engagement of the screw stops j with the extensions 71 of the electrodes in accordanc nature of the are.

e with the apparatus with different tensions and different strengths of current ballast or shunt resistances are used which may be conveniently connected or mounted. Thus for example, a shuntingresistance may be used at 7 for the bridging of the connecting terminals o of the heating resistance wire w. Instead of by springs the scale beam q may be influenced by weights or equivalent means. Various other alterations and modifica t-ions may be made in connection with my invention in order to adapt the same to varying conditions of applications and to the convenience of the user and without deviating from the spirit of my invention, as set forth in the claim hereunto appended.

I claim In an electric arc lamp, a movable electrode member, an extensible resistance wire conductor, a regulating resistance included in said conductor, a spring influenced supporting rod connected to the extensible resistance wire, a scale-beam-like lever pivoted to the supporting rod, guiding means for said lever, adjustable screws near the ends of the lever, adapted for engagement with the movable electrode member.

In witness whereof I affix my signature.

ERIOH omen. 

